The flue gas desulfurization (FGD) circulation pump is one of the key components in the FGD system. Its primary function is to circulate the absorption liquid within the desulfurization tower, ensuring the continuous progress of the desulfurization reaction. This article will discuss the function, working principle, and the importance of the FGD circulation pump in the desulfurization system.
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I. Function of the FGD Circulation Pump: The FGD circulation pump serves several crucial functions, including:
1.Liquid Circulation: The pump is responsible for extracting the absorption liquid, which has absorbed sulfur dioxide (SO2), from the bottom of the desulfurization tower and returning it to the top of the tower. This circulation ensures the reuse of the absorption liquid, which captures SO2 from the flue gas.
2.Sustaining Desulfurization Reaction: By circulating the absorption liquid back into the desulfurization tower, the FGD circulation pump maintains the equilibrium of the reactive liquid inside the tower, ensuring the stability and durability of the desulfurization process. The desulfurization tower plays a critical role in converting SO2 into sulfuric acid through chemical reactions, and the circulation pump's function is to sustain this reaction by maintaining the balance of the reaction liquid.
3.Temperature Regulation: The FGD circulation pump also enables temperature regulation within the desulfurization tower by controlling the circulation speed of the absorption liquid. By adjusting the pump's flow rate, the residence time of the absorption liquid inside the tower can be modified, affecting the reaction rate and efficiency of the desulfurization process.
II. Working Principle of the FGD Circulation Pump:
The FGD circulation pump employs a centrifugal pump design, and its working principle can be divided into the following steps:
1.Liquid Extraction: The FGD circulation pump is connected to the liquid pool or tank at the bottom of the desulfurization tower via an inlet pipe. The pump's impeller creates a negative pressure as it rotates, extracting the SO2-absorbed liquid into the pump.
2.Liquid Pumping: The extracted absorption liquid is forced to flow towards the pump's outlet through the rotation of the impeller, which imparts centrifugal force to the liquid. The design of the centrifugal pump allows the liquid to gain sufficient kinetic energy under the high-speed rotation of the impeller.
3.Recirculation: The liquid at the pump's outlet is transported back to the top of the desulfurization tower through the outlet pipe, where it re-enters the tower for recirculation. This enables the absorption liquid within the desulfurization tower to continuously capture SO2 from the flue gas, ensuring an efficient desulfurization process.
4.The FGD circulation pump is typically equipped with flow control devices and pressure monitoring systems, allowing real-time adjustments and monitoring of the pump's flow rate and pressure. This ensures the safe operation of the system and maintains the stability of the desulfurization efficiency.
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The FGD circulation pump plays a crucial role in the FGD system. By circulating the absorption liquid, it sustains the desulfurization reaction, regulates the temperature within the desulfurization tower, and enhances the desulfurization efficiency. Understanding the function and working principle of the FGD circulation pump is essential for the design and operation of the desulfurization system, as it contributes significantly to environmental protection and the sustainable development of industrial production.
At present, there are dozens of flue gas desulfurization technologies. According to the wet and dry forms of water and desulfurization products, flue gas desulfurization can be divided into wet, semi-dry and dry desulfurization processes. Wet desulfurization technology is mature, efficient and easy to operate.
Flue gas desulfurization vacuum pump is a vacuum pump designed by our company according to the need of flue gas desulfurization in power industry. Wet parts are designed by two-phase flow hydraulic system in accordance with ISO5199 standard. They are made of alloys with strong wear resistance and corrosion resistance. It can use dynamic seals and mechanical seals at the same time; unique design enables mechanical seals to run for a long time without cooling water; its structure is convenient for pipeline layout; it can couple intelligent monitoring system, and can be automatically controlled or integrated with DCS. It is suitable for conveying slurry or slurry produced during flue gas desulfurization, or corrosive liquid containing hard impurities.
Flue gas desulfurization
When flue gas is desulfurized, gypsum slurry will be produced, which needs to be dehydrated by vacuum belt filter to form gypsum products. Some impurities, water vapor and a small amount of water generated by filtration will enter the vacuum pump. Water is used as working medium in the vacuum pump of flue gas desulfurization-liquid ring vacuum pump, and there is a large gap between components. Effective in this working condition can run well to meet the needs of customers, is the ideal choice for users.
Flue gas desulfurization refers to the removal of sulfur oxides (SO2 and SO3) from flue gas or other industrial waste gases. In FGD technology, according to the type of desulfurizer, there are five methods: CaCO3 (limestone) based calcium method, MgO based magnesium method, Na2SO3 based sodium method, NH3 based ammonia method and organic base method.
Why do we need to desulfurize the flue gas?
Desulfurization refers to the process of removing sulfur from fuel before combustion and desulfurization before flue gas emission. This is one of the important technical measures to prevent and control air pollution. With the development of industry and the improvement of people’s living standards, the desire for energy is also increasing. Sulfur dioxide in coal-fired flue gas has become the main cause of air pollution. Reducing sulphur dioxide pollution has become a top priority in atmospheric environmental management. Many vacuum pumps for flue gas desulfurization have been widely used in industry, which have important practical significance for the treatment of various boilers and incinerators.
The specific application should be analyzed in detail, and appropriate vacuum desulfurization technology should be selected from investment, operation and environmental protection. With the development of science and technology, the application of vacuum pump in flue gas desulfurization technology is an important way to develop new flue gas desulfurization technology. Because of its unique characteristics, it is easy to use, easy to install and maintain; no oil leakage, no fuel injection, no pollution to the working environment.) There will be a lot of room for development. With the increasing attention to environmental control and industrial flue gas emissions, the investment and operation cost of desulfurization technology is low, the desulfurization efficiency is high, the utilization rate of desulfurizer is high, the pollution is low, and there is no secondary pollution, which will become the future smoke. The main development trend of natural gas desulfurization technology.
The application of vacuum pump in flue gas has always been an important subject of environmental protection. Mainstream desulfurization technology will continue to be widely used at home and abroad. Under the influence of technical conditions and economic costs, flue gas desulfurization vacuum pump is the first choice for various desulfurization requirements, and will become one of the important technical means of incineration flue gas desulfurization in the future.
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